Decorative knob



FIG. 1 is an upper-right front perspective view of the decorative knob.

FIG. 2 is an upper-left front perspective view of the decorative knob.

FIG. 3 is a lower-left rear perspective view of the decorative knob.

FIG. 4 is a front view of the decorative knob.

FIG. 5 is a right side view of the decorative knob.

FIG. 6 is a left side view of the decorative knob; and,

FIG. 7 is a top view of the decorative knob.

The broken lines are for the purpose of showing exemplary slots, apertures and openings associated with the decorative knob, and they form no part of the claimed design. 

CLAIM The ornamental design for a decorative knob, as shown and described. 